Web guiding roller support



Dec. 29, 19 36. A. .1. HORTON WEB GUIDING ROLLER SUPfjORT Filed May 21, 1932 6 Sheets-Sheet l INVENTOR Dec. 29,-1936. JQHQiQTON 2,066,306

WEB GUIDING ROLLER SUPPORT Fild May 21, v193:2 I 6 Sheets-Sheet 2 1936- A. J. HORTON 2,066,306.

INVENTOR 6 Sheets-Shet 4 A. J. HORTON WEB GUIDING ROLLER SUPPORT Filed May 21, 1932 A m an M wm .lumv wm 2 Wm a 3 mm 5.0 I I 1 1 I {.1 3 mm M a f R E @h a um TL 6% a mm .E Q N E LI II HH MWMWWMWWWW MWWMWMHMMHM IIHMHQ w E Q finiuhluww HHmHMWH MN Dec. 29, 1936.

fmvEN'roR A. J. HORTON WEB GUIDING ROLLER SUPPORT Dec. 29, 1936.

6 Sheets-Sheet 5 Q IN ENTOR Filed May 21, 1932 Dec. 29, 1936. AhJ. HORTON I WEB GUIDING ROLLER SUPPORT 6 Sheets-Sheet 6 Filed May 21, 1932 1 ms ma INVENTOR Patented Dec. 29, 1936 UNITED STATES PATENT OFF-ICE Albert J. Horton, White Plains, N. Y., assignor, by mesne assignments, to B. Hoe & 00., Inc., New York, N. Y., a corporation of New York Application May 21, 1932, :Serial No. 612,699

27 Claims. (Cl. 271-21) larly to a novel method and means for support ing a web guiding roller, so that the tension on both edges of a web running thereover will be uniform. v

Another object is to provide an equalizing support for a web guiding roller that will equalize the tension on either full or fractional width webs, and which will prevent any tendency in the roller itself towards vibration, the development of critical frequencies, and those irregularities in the web guiding mechanism which are due to a misalignment of the center of the axis 01. rotation of the roller relatively to the travelling web supported thereon. v

Another object is to provide an equalizing support for a web guiding roller that will automatically align itself with a web feeding thereover :0 whether of full or fractional width in such wise that all portions of the web adjacent thereto will be under equal tension.

Another object is to provide an equalizing support of the kind indicated with manually adjusta able means for selectively prearranging the support to handle full and fractional width rolls as desired.

A further object is to provide a novel equalizing support of the kind described with eoacting 30 indicating means that will enable the operator of a printing machine to conveniently and expeditiously adjust a web guiding roller to accommodate with equal efliciency a web of full width or one of fractional width. I

It is also an object of the invention to provide an equalizing support of generally improved construction, whereby the device will be simple, durable and inexpensive in construction, as well as convenient, practical, serviceable and efllcient in 40 its use.

With the foregoing-and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed, it

being understood that various changes in the precise embodiment of the invention herein disclosed may be made withinthe scope of what is claimed without departing from the spirit of the invention. v

The preferred embodiments'of the invention are illustrated in the accompanying drawings,

'wherein: v

55 Figure 1 is a fragmentary elevational view,

piartly in section, of an embodiment of the inven- Figure 2 is a fragmentary elevational view, as" seen in the direction of arrow 2 of Figure 1;

Figure 3 is a fragmentary elevational view as seen in the direction of the arrow 3 of Figure 1; Figure 4 is a view as seen in the direction of the arrow 4 of Figure 1;

Figure 5 is a perspective view of the invention, with certain parts broken away; 10

Figure 6 is a plan elevational view of another modified form of the invention;

Figure '7 is a fragmentary elevational view as seen in the direction of the arrow 1 of Figure 6;

Figure 8 is a. fragmentary elevational view as 5 views of the roller shown in Figure 6, illustrating by way of example different transverse axes 'of rotation of same which may be brought selectively into play by the means incorporated in the present invention, and showing the relative amount of motion of the opposite ends of a roller under certain operating conditions. I

Figure 14 is a longitudinal sectional view, partly in elevation, as seen in the direction of the arrows ll of Figure 16, of another modified form of the invention;

Figure 15 is a transverse sectional view taken on line l5--l5 of Figure 14, looking in the direction of the arrows;

Figure 16 is a plan elevational view of the device shown in Figures 14 and- 15;

Figure 17 is a fragmentary elevational view of another modified form of the invention;

Figure 18 is a view looking in the direction of the arrow l8 of Figure 17;

Figure 19 is a viewwsimilar to Figure 18, look-- ing in the direction of the arrow 19 of Figure 17;

. Figure 20 is a fragmentary elevational view of the invention shown in Figures 17 to 19 inclusive;

Figure 21 is a view looking in the direction of the arrow 2| of Figure 20; and

Figure 22 is a perspective view looking in the direction of the arrow 22 of Figure 20, certain 5 manually operated members being omitted .to better show parts concealed in Figure 21.

As is well known to those skilled in the art, a roller used as a guide for a web engaged therewith is subjected to wide variations of pressure and stresses and particularly is this the case when web rolls of different widths are used. For example, a half width web running over a rollerordinarily employed with full width webs, will impose unbalanced stresses or unequal pressures on the opposite ends of said roller as is well known, unless compensated for.

Various means have been employed in the past with a view to adjustably supporting a web guiding roller in which, for example, resiliently supported bearings have been employed. This method, however, does not equalize the pressure or strain at each end of the shaft since if "the web is applying more pressure on one side than another, the resilient means will react with an equal and opposite pressure at that point while at the other end of the same roller shaft, the resilient means will be under less tension or compression. The web, therefore, under the lastmentioned conditions is engaged by the roller with an unequal pressure at the ends thereof, with the same operating disadvantages and dangers to the web as pointed out above. In'Flgures 1 to 5 inclusive and 14 to 22, three forms of the invention are shown wherein a web guiding roller is supported by non-resilient means which provide an absolute equalization of tension over the enltlire periphery of the web adjacent the guiding r0 er.

In Figures 6, 7, 8, another form of the invention is disclosed which actually employs resilient means for supporting a web guiding roller, but under circumstances where equalization of the tension or pressure over the periphery of-the feeding web or at the margins thereof is achieved.

In the drawings wherein similar characters of reference indicate corresponding parts in the form of the invention, shown in Figures 1 to 5 inclusive, l0 designates a roller which may be of any desired design or construction. The roller I0 is rotatably supported on hearing members I I suitably arranged on a shaft l2, the extended ends of which as best shown in Figure 5, are

- secured to blocks or shoes I 3, ll slidabiy positioned in slots I5, Ii provided in a portion of the frame l1 of the printing machine. Keyed or otherwise secured to the shaft II at either side of the roller iii are a pair of oppositely directed links or arms l8, l3 whose relative position on the shaft ends differs approximately by 180". The links l3, l9 are provided respectively with slots 4:, l9 wherein slidabiy ride shoes or blocks 22,

To the block 22 one end of a link 25 which is rockably mounted on a portion of the frame l1 by a pin or stud 25, is hingedly connected by a pin 26, while to the block 23 an arm 21 is pivotally connected. Hingedly secured at one end to the link 24 is a second link 23, the other end of which is pivotally secured to an arm or member 23 keyed or otherwise fastened to a rock shaft II on which the arm 21 is fastened, the said rock shaft being mounted in bearing brackets 32, 33 fastened to any convenient portion of the printing' machine. To one end of the rock shaft 3| an operating handle 34 is secured, the said operating handle 34 having a manually controlled latch 33 provided with a pin 30 one end of which is adapted to be received in a plurality of holes 31 arranged in series on a plate 33 with suitable indicating means 33, as shown in Figures 3'and 19, placed adjacent said holes, and an indicator or pointer 33' secured to or forming "a part of the handle 34 to denote the roller adjustment desired, which as shown may be for a full width roll, roll or ,5 roll, it being observed, as indicated on the means 33 that the or $5 med roll may be positioned on either the left or right hand side of the roller ll, thereason for which will be *explained" hereinafter. The pointer 33',

' other manually adjusted forms hereinafter described, for equalizing the tension of a web passing over or engaged with a roller by shifting a transverse axis of the said roller when a web of one width, for example, a half width web is sub- .stituted for a web of full width. The actual shifting of the axis of rotation of the roller Ill from one pivot point to another is indicated' by the difl'erent positions of the dots in Figures 9 to 13 inclusive, the point 40 denoting the transverse axis of rotation for a full width roll, while the other dots denote the transverse axes' of rotation for and rolls when positioned to left or right of the center of the roller.

Whenthe pin 36 as shown in Figure 3 is, for example, placed in one of the series of holes 31 and the pointer 39' thereon opposite the notation "full, the transverse axis of rotation of the roller It! will be substantially at the center of the roller III, as indicated by the centrally-positioned dot 40 in Figure 11. When the pointer 33' is placed opposite the left hand notation, as

shown in Figure 3, the transverse axis of rotation will be positioned at the dot III of; Figure 10. Should the pointer or indicator 39" be placed opposite the right hand notation "A", theaxis of rotation will be positioned at the dot 4| (Figure 12). The shifting of the transverse axis of the roller to accommodate webs of other than full widths, generally and width webs, by the manually operable means shown in Figures 1 to 5 may be best understood by a comparison of the relative position of the shoes 22, 23 in the equally dimensioned slots l8. IQ of the equal and oppositely arranged links or arms I3, l9. When both shoes 22, 23 are at the center of their respective slots l8, is with the pin 36 of the operating handle 34 in the center hole of the series of holes 31, the transverse axis of the roller ill will be positioned at its own center since the arcs described by the links M, I3 will be equal.

When, however, by the operating means illustrated, one of the blocks 22, is positioned at the outer portion of one slot II and the other block 23 at the inner portion of the other slot 13, then the arcs described by the links will be unequal and the transverse axis of the roller will be shifted, this action being more fully described in connection with Figure 20. The net result of this when the form shown in Figures 1 to 5 inclusive is employed, will be to predetermine the transverse axis of the roller for a web of given and having transverse axis conforming with the center of the travelling web. M

7 Figures 6 to 8 inclusive illustrate another form of the invention which provides an automatic adjustment for a web guiding roller so that same may be predeterminedly arranged to compensate or equalize the stresses on webs of various widths asthey pass oveisame. In the form shown, the ends of a shaft 5| on which the body portion of a roller 52 is rotatably supported, are secured in blocks 53,14 slidabiy mounted in slots or sockets 55, 56 arranged in the frame 51 of the printing machine. The block 53 is hingedly connected to a bell crank lever 58 pivotally mounted on a fulcrum pin or stud 58 secured to a portion of the said frame. The lever 58 has an extension or arm 59 provided with a slot 88 which slidably accommodates a locking pin or thumb screw on a bar 62 to allow for various adjustments desired, as hereinafter described. The bar 62 passes through an opening in a lug 83 of another bell crank lever 84 and is provided at an end adjacent to the lever 84 with a spring 65, the latter being confined on the bar we nut 85 which forces the spring against the lug 63 of the bell crank lever. A sleeve or collar 81 limits in one direction'the longitudinal movement of the bar relatively to the lug 83, while the spring 65 opposes a resistance to its longitudinal movement in the other. The axial shifting of the roller 52, as hereinafter explained, is confined within restricted limits by a link 68 which is pivoted' at one end to the bell crank lever 58 and is slotted as at 69 to receive a pin 18 secured to the crank lever 64.

It will be observed that when the thumb screw' 6| in the slot 68 has been tightened to secure the adjustable end of the bar 82 in a horizontal posi tion on the extension 59 of lever 58, as shown in full line in Figure 6, swinging movement of the bell crank levers 58, 84 in response to movements of the ends of the roller 52 will cause equal and opposite movements of the blocks 53, 54 within the limits afforded by the movement of the pin 18 within the slot 69 of the link 88. The above movement of the blocks 53, 54 to which the roller 52 is attached, permits the latter to automatically align itself as variations in the tension of the web thereon occur, such as a fullness or slackness on either edge.

It will also be noted that movements communicated to the two bell crank levers 58 and 84 by the bar 82, if not horizontally positioned, will cause disproportionate movements of the blocks supporting the roller 52 thereby positioning or angling same in alignment with a web running thereover for equalizing the tension of any one of different webs in the manner above indicated, the transverse axis of the roller being shifted from the middle point for a full width web to a point removed therefrom, as illustrated.

While the roller 52 as shown in Figure 6 is resiliently or yieldingly supported relatively to the frame on the blocks 53, 54 and spring 85 and its' connections thereto, as described above,

, the said connections are such as to maintain an aligned position of the roller with the web thereon under uniform tension in contra-distinction to conventional resilient supports for web guiding rollers .whereon feeding webs with widely differing pressures at the opposite margins or sides thereof in case of fullness or slackness of the web at either edge.

In the form of the invention shown in Figuresv 14 to 16 inclusive, 15 designates a roller supported in accordance with the present invention. The roller 15 is rotatably mounted on a shaft 18, the ends of which are secured in arms or brackets 11, 18 formed integrally with or secured to a bar. or member 19 which is pivotally supported on a block 8| by a bolt 82, slidable in a slot 19 in the bar 19. 83, 84 mounted on pins 85 arranged at the opposite ends of the bar 19. A rod or bar 85 provided with a thread 81 engaged in'a hole formed in the block 8| is rotatably mounted in bearing The member 19 is braced by sheavesblocks 88, 89 fastened by screws 9|, 92 and has an operating handle 93 secured thereto. It will be understood that the block 8| which is slidably mounted on a base or frame member 94 may be moved to vary the transverse axis of the roller 15 from a mid-point as indicated by the dot 95 to other points removed therefrom as indicated by the other dots on the roller 15 shown in Figure 14 without causing any unbalanced stress or tension-at one side of the web not compensated for at anothenside of the web. The present form of the invention is particularly adapted for regulating or equalizing tension of the web engaged over a roller approximately as best shown in Figure 15.

In Figures 17 to 22 another modified form of the invention is shown which accomplishes the purpose of the present invention by means somewhat different than the other forms of the invention. In the instant form of the invention, it will be noted that the shaft of the web engaging roller IN is fastened to links and bars whose connection to the frame of the printing machine is such that when the latter are moved vertically, thereby bodily lifting the roller IN,

the links will be angled disproportionately and the roller consequently shifted to other and different transverse axes. In the form shown in Figures 1.,

mediary of the links I8, I9 together with the other associated parts whereby manipulation of the operating lever will result in an adjustment or shifting of the transverse axis of the roller to another transverse axis. be understood the actual movement or shifting of the rollers is preferably quite limited and only suificient for achieving the purpose desired.

Referring to the form shown in Figures 17 to 22 the roller |8I is provided with a shaft I82 which is fastened on self-aligning bearings I33, I84 arranged in blocks I85, I86. The blocks I85, I88 are secured to resiliently-supported depending arms or bars I81, I88 respectively, each of which is slidable through an opening in a plate In both cases, it is to orportion of the frame I89 of the associated are shifted by lifting same, thereby moving the I arms hereinafter described attached thereto.

The bars I81, I88 are provided with nuts or abutments H2, 3 which are engaged by forked ends on each of the arms I I4, I I5 secured or keyed to shaft H8 on which shaft an operating handle I I8 is fastened. The operating handle or member 8 has a latch grip II9, which is hinged or fulcrumed as at I2I to the operating member H8. The latch grip H9 is provided with a pin I22 and the arm 8 is provided with an indicator or pointer I22, the said pointer coacting with a dial or indicator means I 23 having a series of holes I24 which receive the said pin I22 for the purpose of adjusting the roller "II to receive full or fractional width webs. It will be observed in the present form of the invention, as in the form shown in Figures 1 to 5 inclusive, the pointer I22 is positioned one notch or hole I24 in advance of the pin I22. Y

The bars I81 and I88 whichare raised and maintained in adjusted position by the arms I I4, II5 reciprocate in ledges or projections I25 and v shifting of the axis of the roller IOI from the.

I26 formed on or secured to the frame I21 of the machine. Portions of the shaft I02 on opposite sides of the roller IOI have connected thereto links or arms I28, I29 projecting from the shaft in opposite directions which are formed respectively with slots I3I, I32, the said slots slidably receiving elements I33 through which pins or studs I34 secured in the frame I21, are inserted. It will now be understood that when the operating handle H3 is swung to lift the arms H5, the rods or bars I01, I08 carrying the roller IOI will be raised upwardly in the direction of ,the lift 01 the springs I I0 mounted on the said rods I01, I08 and confined thereon against the frame or plate I09 by the nuts III. As the'bars or rods I01, I00 are lifted, the links or arms I20, I 29 which are adjustably locked or keyed to the shaft I 02 will be raised on their pivot studs I34 to a limited degree, thereby shifting the transverse axis of the roller in the manner described above in connec-' tion with the form shown in Figures'i to 5.

By inspection of Figures 20 to 22 inclusive, the

middle point to-points on either side thereof, as the operating handle is manipulated will be understood. In the actual position shown, and as denoted by the uppermost of the transverse dot and dash lines of Figure 20, the roller is set for accommodating a half width web I35 positioned on the right hand side of the roller, the point or dot I36. indicating the transverse axis of the roller in the position indicated. A similar explanation holds true for the other points or dots shown on the roller IOI of Figure 20 which will serve as transverse axes of rotation for the roller when the 'operating handle has been manipulated to shift the pivotal point of the roller from one transverse axis to another. The mechanical advantages obtained by shifting the axis of the roller from the center to a point removed therefrom as a fractional width web is substituted for a full width web have been fully explained.

The above method and means may be applied advantageously under analogous conditions; L e., wherever a roller or cylinder is employed to guide a web and in fact the invention can be associated with mechanism widely removed from printing mechanism or in various machines operating on or employed with webs.

It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired the present embodiment be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

What I claim is:

1. In a printing machine, in combination, a roller and a supporting device for said roller adjustable to permit its axis to pivot at a plurality of points and under the center of a web variably positionable thereon and maintain equal tension on both edges of said web.

2. In a printing machine, in combination, a roller, means for supporting said roller and adjustable for permitting it to swing about a plurality of transverse axes, each of said axes'being located at the center of a web variably positionable thereon while maintaining equal tension at both edges of said web.

3. In a device for equalizing the tension on be edges of'a web of paper being fed to a printii machine, in combination, a roller and a suppor ing device for pivotally supporting said rolle said supporting device being adjustable to one position to permit the roller to swing on a central transverse axis and to another position to permit the roller to swing on a transverse axis at the center of a narrow web constantly running near one end of the roller.

4. In a device for equalizing the tension on both edges of a web of paper being fed to a printing machine, in combination, a roller and a supporting device for pivotally supporting said roller; said supporting device being adjustable to one position to permit the roller to swing on a transverse axis at the center of a web running near one end of the roller and to another position to permit the roller to swing on a transverse axis at the center of a web constantly running near the other end of the roller. 1

5. In a device for equalizing the tension on both edges of a web of paper being fed to a printing machine, in combination, a roller and a supporting device pivotally supporting said roller; .said supporting device being adjustable to a plurality of positions whereby the roller may swing on a transverse axis at the center of a web that is centrally positioned with respect to the roller or positioned adjacent and running constantly over either end thereof.

6. In a device of the kind described,.a roller having extending shaft ends, shoes secured to said shafts and slidably received in sockets, arms arranged on opposite endsof said shafts at positions differing by approximately members slidably secured to said arms and connected to manually controlled means, whereby when said manually controlled means are actuated, said members will be moved and said roller shifted from one position suitable for equalizing tension over a full width web toanother position suitable said arms, one of said links being hingedly secured to a portion of a printing machine, another link connected at one end to said last mentioned link and to an arm on a manually controlled shaft, a second member secured to said shaft and connected to the other of said arms by a link pivotally connected to another link slidably secured in the last mentioned arm.

8. In a mounting for a web roller for a printing machine, end supports movable oppositely to each other by variations in length of opposite edges oi? a web, said supports being so moved as to pivot the roller about an axis substantially in line with the center of a web running nearer one end of the roller than the other, whereby equal tension is.

maintained on both edges of the web.

9. A roller, a bearing for each end of said roller,

"nearer one end thereof than the other.

10. In a device of the character described, a roller rotatably mounted on supports and movable with said supports about a first transverse axis midway of the length of the roller and at the 7 aoeaaoa center of a web running thereover, and means to pivotthe roller about a second transverse axis, said second axis coinciding with the center of a web positioned nearer one end of the roller than the other.

11. In a device of the character: described, a roller, and movable supports for said roller adapted to locate a transverse axis of oscillation of.said' roller so that it may pivot at the center-of a narrow web running continuously upon and adjacent one end of the roller, whereby the said web may be maintained constantly at the end of the roller and the tension at the edges of said web equalized.

12. In a mounting for a web roller, en'd supports movable oppositely to each" other by the pull of a Web, and a resilient connection including a spring between the supports whereby the 'roller is moved bodily by variation in tension over theentire web, and swung to maintain equal tension on both edges of the web.

13. In a mounting for a web roller, end supports movable oppositely to each other by the pull of a web, and a yielding connection between the supports whereby the roller is moved bodily by varia tion in tension over the entire web, and swung on a transverse axis by unequal tension on opposite edges of the web.

14. In combination, two movable en'd supports, a web roller rotatable relatively to said supports, and a yieldingconnection between the supports whereby the roller is resiliently supported to maintain substantially constant web tension and equal tension on both edges of the web.

15. In combination, two movable end supports, a web roller rotatable relatively to said supports, and a yielding connection between the supports whereby the roller is resiliently supported to maintain substantially constant web tension and equal tensionon both edges of the web; said connection being adjustable to increase the motion of one support relative to the motion of the other support.

16. In a mounting for aweb roller, means movably and resiliently mounted for supporting said web roller, pivoted lever. means secured to said first mentioned means, and other means including lev'er means for supporting the roller with variable resilience and maintaining equal tension on both edges of the web.

17. In a mounting for' a web roller having shaft ends held in blocks fastened to rockingly mounted levers, a member joining the levers, means for angling and adjusting the member relatively to at least one of sa'd-l 1 avers and resment means nected to the frame and about which the-said adjustably secured-to the member for varying the degree of resilience with which the roller is supported.

18. In a mounting for a web roller having shaft ends held to members movable in guide ways formed in a frame, said members being connected to pivoted levers joined by a bar adjustable relatively to one of said levers, and variable resilient means mounted on the bar, whereby said roller may be moved bodily by variations intension in a web arranged on' the roller, and swung to main,- tain equal tension on both edges of the web.

19. In a mounting for a web roller having a shaft, members supporting said shaft, said members being reciprocatingly mounted in guide ways and fastened to hell cranks pivoted to a frame, and resilient means mounted on a member connecting said bell cranks, whereby said first-mentioned memberswill move oppositely toeach other by the pull of a web arranged on the roller for maintaining equal tension on both edges of the web.

20. In a mounting for a web roller, the combination of end supports for the roller which are connected to lever means pivoted on a'frame and joined by a bar, a spring adjustably secured at one end of said bar, and a stop connecting the lever means, whereby the end supports move oppositely to each other as the said rollerswings on roller bodily in response to the pull of the-web.-

motion between the pivot members and the shaft.

whereby the distance'between one pivot member and the shaft may be increased, and simultaneously the distance between the other pivot mem ber and the shaft will be decreased;

22. In a device for equalizing tension on both edges of a web of paper being fed to a machine having a frame, in combination, a roller rotatably supported in a supporting member, a pivot member adjustably secured to the-frame and on which .the supporting member-swings to pivot 23. In a device for equalizing the tension on 'both the edges of a web of paper being fedto a printing machine, in combination, a web guiding roller, supporting means for the roller adapted to permit it to swing about a transverse axis, other means to which the supporting means is pivotally connected and threaded means for moving said other means, whereby the transverse axis ofrotation of the roller may be shifted from one position to another.

24. In a device for equalizing tension on both I edges of aweb of paper being fed to a machine having a'frame, in combination, a roller about which the web is led, a supporting member having bearings for rotatably supporting the roller, said member'h'aving an arm beyond one end of the roller and an'oppositely disposed arm beyond .the other end of the roller, and pivot members conarms are arranged toswing, and thereby swing the roller bodily on a transverse axis. Y

25. Ina device for equalizing the tension on both edges of a web of paper being fedto a machine having a frame,in combination, a shaft, a

roller rotatable on the shaft, a pair of arms, said arms being secured to the shaft in oppositely disposed relation and beyond each end of the roller,

and pivot members about which the arms swing and that are connected to the frame.

26. In a machine having a web running thereto, in combination, a roller adapted to have a i I .s, oss,sos-

ssidweb ndmesnstoadJustsaidsunportingde- 27.1nadevice1orequalizingthetensionon both, edges of s web being fed into ,a machine 5 operating thereon, in combination, a roller hsvin; a web running over an oil-center portion thereof, a supporting device for :otatably supporting said roiier and being adjustable to cause the end a: ma roller that is nearer the web running tbereover to move a lessens-mount than the other end oi said roiler, to swing said roller on'a tiansvei'se axis disposed substantially at the center of the web. and mesns'to adjust saidsupportin: device.

. smm'rs. non'ron. 

